package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    /**
     * 删除不与菜品套餐关联的分类
     * @param id
     */
    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;
    @Override
    public void remove(Long id) {
        //查询是否关联菜品和套餐，关联抛出异常，删除失败
        //到dish表中查找 select count(*) from Dish where category=id
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper=new LambdaQueryWrapper<Dish>();
        //设置过滤条件
        dishLambdaQueryWrapper.eq(Dish::getCategoryId, id);
        int count = dishService.count(dishLambdaQueryWrapper);
        if(count>0){
            //已经关联菜品，抛出业务异常
            throw new CustomException("不能删除已经关联菜品的分类");
        }

        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper=new LambdaQueryWrapper<Setmeal>();
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId, id);
        int count1 = setmealService.count(setmealLambdaQueryWrapper);
        if(count1>0){
            //已经关联套餐，抛出业务异常
            throw new CustomException("不能删除已经关联套餐的分类");
        }
        //正常删除
        super.removeById(id);

    }
}
